Yep, the control panel is a concern if it should fail. Could always cobble in an aftermarket panel. The engine computer and coil pack are items still supported by Ford and Autozone. Even though low in hours it is at least 20 years old. He is asking $3000 which seems overpriced, even with the low hours.The generator appears to be of good quality.
Finding parts for the controller may be a problem, but a good technician could repair the board with the exception of the ICU.
With no more than 225 hours it may well be worth a try if the price is right.
I looked up powermate.com and they clearly do not make the large version of the generator you are seeking. Powermate is a separate company from Coleman and did go into bankruptcy in 2008.